d_time2FILETIME

[Steven Schveighoffer]

On Fri, 10 Apr 2009 10:07:20 -0400, Andrei Alexandrescu  
<SeeWebsiteForEmail at erdani.org> wrote:

> Hello,
>
> I want to port the function setFileTimes available in Phobos/Posix to  
> Windows. Does anyone know of a simple way to convert a d_time value to a  
> FILETIME value? d_time is Ticks since 1-1-1970 and FILETIME contains  
> quanta of 100-nanoseconds since 1-1-1601. So there's only some shifting  
> and scaling involved, but the shifting constant is tricky :o).

What you need is the constant that is the number of Ticks (either 100ns  
ticks or whatever) from 1601 to 1970.

I redid most of the tango time stuff, but those constants were already  
there before my time (no pun intended).  The number of seconds between  
1/1/1601 and 1/1/1970 is 11644473600.  Scale that to whatever you wish.

Note that we do not take into account leap-seconds, not sure if that  
matters to you.

-Steve